If a coupling facility changes to the volatile state, the system
logger on each system using the coupling facility structure is notified.
A dynamic rebuild of the structure is initiated so that the log data
can be moved to a non-volatile coupling facility. During rebuild processing,
system logger rejects any logger service requests.
If there is not a structure available in a non-volatile coupling
facility, system logger will still rebuild the data on a new volatile
coupling facility. System logger may then change the way it duplexes
coupling facility data since the volatile coupling facility constitutes
a single point of failure:
- For log streams defined with STG_DUPLEX=YES, system logger will
begin duplexing data to staging data sets, if they were not already
in use.
- For log streams defined with STG_DUPLEX=NO, system logger will
keep on duplexing data to local storage buffers on each system.